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Every 2 pieces in a small bag for easy use. All the filters have been professionally tested and are qualified products .
5 Layer Filtration technology: filters are Made of activated carbon and non-woven melt-blown filter cloth, five-layer filter system effectively keep away from a range of airborne contaminants, Dust, Haze, Allergies,Smoke,Pollution,Ash, Pollen,hazardous chemicals, heavy metal particles etc.
Size of Adults Mask Filter: 4.7''x3.1''. Suit for adults mouth mask insided with fliter slot.
How to use:Insert the PM2.5 filter along the inside of the mask and use it, Refer to Fifth picture.
Disposable supplies can't be reused or washed. Recommend replace filter once a week for the best effect or 3 day If there is serious contamination.